High-temperature tribological behavior of Mo and BaF2 added Cr3C2-NiCr matrix composite

摘要

Purpose The purpose of this paper is to investigate the tribological performance of Cr3C2-NiCr-Mo-BaF2 composite sliding against a Si3N4 ball at high temperatures. Design/methodology/approach A Cr3C2-NiCr composite and a Cr3C2-NiCr-Mo-BaF2 composite were prepared using spark plasma sintering. Tribological properties of the composites were investigated using a ball-on-disk type tribotester. The relationships among the microstructure, wear mechanism and tribological performance were determined by analyzing the wear track morphologies and the glaze layer's phase composition. Findings The wear rate of the Cr3C2-NiCr-Mo-BaF2 composite was approximately one order of magnitude lower than that of the Cr3C2-NiCr composite from 700 degrees C to 900 degrees C when sliding against a Si3N4 ball. The favorable tribological performance of the Cr3C2-NiCr-Mo-BaF2 composite at high temperatures results from the synergistic lubrication of MoOx, BaF2 and BaMoO4. Originality/value This paper reports a new Cr3C2-NiCr matrix self-lubricating composite with better tribological properties than Cr3C2-NiCr composite at temperatures up to 900 degrees C through Mo and BaF2 addition.